论文标题
了解带有轻$ z'$和第二个Higgs Doublet的Miniboone和Muon和Electron $ G-2 $异常
Understanding the MiniBooNE and the muon and electron $g-2$ anomalies with a light $Z'$ and a second Higgs doublet
论文作者
论文摘要
标准型号（SM）的两个最广泛研究的扩展名是$ a）$在其现有量规组中添加了新的$ u（1）$对称性，而$ b）$扩展其标量扇区以结合第二个Higgs Doublet。我们表明，合并后，它们使我们能够理解在迷你酮（MB）实验中看到的类似电子事件的过量事件，并考虑了观察到的哑光磁矩异常值。与额外的$ u（1）$相关的轻$ z'$与baryons和黑暗区域相关，并与leptons的风味非全偶联，以及第二个Higgs Doublet，能够解释MB的多余。 $ z'$从深色单线标量量质量中获得了质量，该标量与两个希格斯双打量混合在一起。选择基准参数值，我们表明$ u（1）_ {b-3l_τ} $，无异常，$ u（1）_b $，都提供（现象学上）对多余的同样好的解决方案。我们还指出了另一个（1）$ u（1）$选择，这些选择是在更全面探索参数空间时可能可以的。我们获得了与MB中中微子和抗中性氏菌的能量和角分布相匹配的。扩展的希格斯行业有两个轻度的CP-even标量，$ h'$和$ h $，它们的群体和耦合原则上有助于解释MB的过剩以及当前观察到的Muon和Electron $ G-2 $的值。我们讨论模型上的限制以及未来的测试。我们的工作强调了光标量在理解当今的低能异常中所起的作用。它还指出了可能存在到黑暗区域的门户网站，即，轻型玻色片$（z'）$和与活性中微子混合的深色中微子，以及与扩展的希格斯行业混合的深色扇形光标量。
Two of the most widely studied extensions of the Standard Model (SM) are $a)$ the addition of a new $U(1)$ symmetry to its existing gauge groups, and $b)$ the expansion of its scalar sector to incorporate a second Higgs doublet. We show that when combined, they allow us to understand the electron-like event excess seen in the MiniBooNE (MB) experiment as well as account for the observed anomalous values of the muon magnetic moment. A light $Z'$ associated with an additional $U(1)$ coupled to baryons and to the dark sector, with flavor non-universal couplings to leptons, in conjunction with a second Higgs doublet is capable of explaining the MB excess. The $Z'$ obtains its mass from a dark singlet scalar, which mixes with the two Higgs doublets. Choosing benchmark parameter values, we show that $U(1)_{B-3L_τ}$, which is anomaly-free, and $U(1)_B$, both provide (phenomenologically) equally good solutions to the excess. We also point out the other (anomaly-free) $U(1)$ choices that may be possible upon fuller exploration of the parameter space. We obtain very good matches to the energy and angular distributions for neutrinos and anti-neutrinos in MB. The extended Higgs sector has two light CP-even scalars, $h'$ and $H$, and their masses and couplings are such that in principle, both contribute to help explain the MB excess as well as the present observed values of the muon and electron $g-2$. We discuss the constraints on our model as well as future tests. Our work underlines the role that light scalars may play in understanding present-day low-energy anomalies. It also points to the possible existence of portals to the dark sector, i.e., a light gauge boson field $(Z')$ and a dark neutrino which mixes with the active neutrinos, as well as a dark sector light scalar which mixes with the extended Higgs sector.
